Fire officials are asking residents to stay away from Brighton Avenue between Linden Street and Harvard Avenue, as well as to Cambridge Street to Commonwealth Avenue. Commuters should expect grid lock on Cambridge Street from Lincoln Street to Union Square in Allston.

A portion of the building reportedly collapsed, though it wasn’t immediately clear whether it was a roof or a wall of the building. Firefighters established a safety perimeter around the building to prepare for any possible further collapse.

At one point, responders were ordered out of the building due to safety concerns. Five firefighters were treated for injuries, with three treated at the scene and two other taken to area hospitals for a shoulder injury and smoke inhalation.